Last year we filed an extension and struggled to file before the extended deadline. This year was better and we mailed it off yesterday.
It seems that if you are too charitable you can't file electronically. Specifically, if you need more than two copies of form 8283, Noncash Charitable Contribution, then you must mail in your taxes forms.
The problem is that each time you give things away, whether it's gifts for the "Angel Tree" at XMAS time, or canned goods to the food bank, or used clothing and household goods to the many organizations that leave plastic bags on your door, you get a receipt and take up one line of form 8283. And each form 8283 can only record five (5) such donations. We went to four forms 8283 this year.
Next year we will give things away in fewer chunks.